docs: def rsa_decrypt_base64_encoded_key(rsaprivatekey, enckey):
      # type: (cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey,
      #        str) -> bytes
      """Decrypt an RSA encrypted key encoded as base64
      :param rsaprivatekey: RSA private key
      :type rsaprivatekey:
          cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey
      :param str enckey: base64-encoded key
      :rtype: bytes
      :return: decrypted key
      """
      return rsaprivatekey.decrypt(
          base64.b64decode(enckey),
          cryptography.hazmat.primitives.asymmetric.padding.OAEP(
              mgf=cryptography.hazmat.primitives.asymmetric.padding.MGF1(
                  algorithm=cryptography.hazmat.primitives.hashes.SHA1()
              ),
              algorithm=cryptography.hazmat.primitives.hashes.SHA1(),
              label=None,
          )
      )